Syrian Regime Bombards Islamic State Stronghold

Many Civilians Killed, Say Activists and Residents

BEIRUT—Syrian warplanes pounded the northern city of Raqqa, a stronghold of extremist group Islamic State, killing dozens of people, according to residents and antigovernment activists.

The U.S.-led coalition conducting airstrikes on Islamic State in Syria and Iraq has also attacked Raqqa as recently as Monday, showing how Western interests are aligning with those of President Bashar al-Assad’s regime on at least one front in the...